[PATCH] [mips][microMIPSr6] Implement SELEQZ and SELNEZ instructions

[Zoran Jovanovic]

LGTM with a nit.


================
Comment at: test/MC/Disassembler/Mips/micromips32r6.txt:27
@@ +26,3 @@
+
+# CHECK: seleqz $2, $3, $4
+0x00 0x83 0x11 0x40
----------------
Nit: Please use the single-line style.

http://reviews.llvm.org/D8497

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